There are a number of theories in the Western World about the intended purpose of this majestic Incan site (agricultural research, elevation-related analysis, irrigation experimentation, portal, etc.). Regardless, it's evident in the acoustical engineering and sheer magnitude of Moray that it was incredibly significant to those who designed it, and it's nothing short of a "must-see" for anyone traveling between Cusco and Machu Picchu.
A visit to Moray was a rather serendipitous side-trip recommendation from my driver, while I was en route from Cusco (where my flight arrived) to Ollantytambo (where I was to catch the PeruRail train to Machu Picchu Pueblo). The entire site was literally empty, leaving ample opportunity for one-of-a-kind photos and once-in-a-lifetime exploration of the entire area. It was also a great way to break up the long car ride, as there was plenty of hiking involved going up and around the many layers. If time permits, tag on a quick stop to the Salineras de Maras, not too far away, and you'll have a vacation full of stories to share before you even make it to Machu Picchu.